diff --git a/esphome/components/lvgl/__init__.py b/esphome/components/lvgl/__init__.py
index dd49efd447..4a450375c4 100644
--- a/esphome/components/lvgl/__init__.py
+++ b/esphome/components/lvgl/__init__.py
@@ -466,7 +466,7 @@ LVGL_SCHEMA = cv.All(
                 ): lvalid.lv_color,
                 cv.Optional(df.CONF_THEME): cv.Schema(
                     {
-                        cv.Optional(name): obj_schema(w)
+                        cv.Optional(name): obj_schema(w).extend(FULL_STYLE_SCHEMA)
                         for name, w in WIDGET_TYPES.items()
                     }
                 ),
diff --git a/esphome/components/lvgl/schemas.py b/esphome/components/lvgl/schemas.py
index a0be65c928..959d203c41 100644
--- a/esphome/components/lvgl/schemas.py
+++ b/esphome/components/lvgl/schemas.py
@@ -21,7 +21,7 @@ from esphome.core.config import StartupTrigger
 from esphome.schema_extractors import SCHEMA_EXTRACT
 
 from . import defines as df, lv_validation as lvalid
-from .defines import CONF_TIME_FORMAT, LV_GRAD_DIR
+from .defines import CONF_TIME_FORMAT, LV_GRAD_DIR, TYPE_GRID
 from .helpers import add_lv_use, requires_component, validate_printf
 from .lv_validation import lv_color, lv_font, lv_gradient, lv_image, opacity
 from .lvcode import LvglComponent, lv_event_t_ptr
@@ -349,7 +349,60 @@ def obj_schema(widget_type: WidgetType):
     )
 
 
+def _validate_grid_layout(config):
+    layout = config[df.CONF_LAYOUT]
+    rows = len(layout[df.CONF_GRID_ROWS])
+    columns = len(layout[df.CONF_GRID_COLUMNS])
+    used_cells = [[None] * columns for _ in range(rows)]
+    for index, widget in enumerate(config[df.CONF_WIDGETS]):
+        _, w = next(iter(widget.items()))
+        if (df.CONF_GRID_CELL_COLUMN_POS in w) != (df.CONF_GRID_CELL_ROW_POS in w):
+            # pylint: disable=raise-missing-from
+            raise cv.Invalid(
+                "Both row and column positions must be specified, or both omitted",
+                [df.CONF_WIDGETS, index],
+            )
+        if df.CONF_GRID_CELL_ROW_POS in w:
+            row = w[df.CONF_GRID_CELL_ROW_POS]
+            column = w[df.CONF_GRID_CELL_COLUMN_POS]
+        else:
+            try:
+                row, column = next(
+                    (r_idx, c_idx)
+                    for r_idx, row in enumerate(used_cells)
+                    for c_idx, value in enumerate(row)
+                    if value is None
+                )
+            except StopIteration:
+                # pylint: disable=raise-missing-from
+                raise cv.Invalid(
+                    "No free cells available in grid layout", [df.CONF_WIDGETS, index]
+                )
+            w[df.CONF_GRID_CELL_ROW_POS] = row
+            w[df.CONF_GRID_CELL_COLUMN_POS] = column
+
+        for i in range(w[df.CONF_GRID_CELL_ROW_SPAN]):
+            for j in range(w[df.CONF_GRID_CELL_COLUMN_SPAN]):
+                if row + i >= rows or column + j >= columns:
+                    # pylint: disable=raise-missing-from
+                    raise cv.Invalid(
+                        f"Cell at {row}/{column} span {w[df.CONF_GRID_CELL_ROW_SPAN]}x{w[df.CONF_GRID_CELL_COLUMN_SPAN]} "
+                        f"exceeds grid size {rows}x{columns}",
+                        [df.CONF_WIDGETS, index],
+                    )
+                if used_cells[row + i][column + j] is not None:
+                    # pylint: disable=raise-missing-from
+                    raise cv.Invalid(
+                        f"Cell span {row + i}/{column + j} already occupied by widget at index {used_cells[row + i][column + j]}",
+                        [df.CONF_WIDGETS, index],
+                    )
+                used_cells[row + i][column + j] = index
+
+    return config
+
+
 LAYOUT_SCHEMAS = {}
+LAYOUT_VALIDATORS = {TYPE_GRID: _validate_grid_layout}
 
 ALIGN_TO_SCHEMA = {
     cv.Optional(df.CONF_ALIGN_TO): cv.Schema(
@@ -402,8 +455,8 @@ LAYOUT_SCHEMA = {
 }
 
 GRID_CELL_SCHEMA = {
-    cv.Required(df.CONF_GRID_CELL_ROW_POS): cv.positive_int,
-    cv.Required(df.CONF_GRID_CELL_COLUMN_POS): cv.positive_int,
+    cv.Optional(df.CONF_GRID_CELL_ROW_POS): cv.positive_int,
+    cv.Optional(df.CONF_GRID_CELL_COLUMN_POS): cv.positive_int,
     cv.Optional(df.CONF_GRID_CELL_ROW_SPAN, default=1): cv.positive_int,
     cv.Optional(df.CONF_GRID_CELL_COLUMN_SPAN, default=1): cv.positive_int,
     cv.Optional(df.CONF_GRID_CELL_X_ALIGN): grid_alignments,
@@ -474,7 +527,10 @@ def container_validator(schema, widget_type: WidgetType):
         result = result.extend(
             LAYOUT_SCHEMAS.get(ltype.lower(), LAYOUT_SCHEMAS[df.TYPE_NONE])
         )
-        return result(value)
+        value = result(value)
+        if layout_validator := LAYOUT_VALIDATORS.get(ltype):
+            value = layout_validator(value)
+        return value
 
     return validator
 
diff --git a/tests/components/lvgl/lvgl-package.yaml b/tests/components/lvgl/lvgl-package.yaml
index 212e30c1eb..2edc62b6a1 100644
--- a/tests/components/lvgl/lvgl-package.yaml
+++ b/tests/components/lvgl/lvgl-package.yaml
@@ -839,9 +839,7 @@ lvgl:
                       styles: bdr_style
                       grid_cell_x_align: center
                       grid_cell_y_align: stretch
-                      grid_cell_row_pos: 0
-                      grid_cell_column_pos: 1
-                      grid_cell_column_span: 1
+                      grid_cell_column_span: 2
                       text: "Grid cell 0/1"
                   - label:
                       grid_cell_x_align: end